Hi,

I once pulled a faulty one apart to see what was in it. As I
remember there was a pancake coil with some ferrite slabs
attached (presumably for tuning), a couple of large SCRs or
IGBTs, some large capacitors (film type I think), a small board
with a handful of DIL chips and the power supply which was
similar in topology to one you might find in a SMPS. I have a
couple of Fairchild PDF files on the subject if you want them
although they total about 500k un-zipped.

They are useful I find for their original purpose though. In
fact I have one in my store cupboard for occasional use outside,
in the workshop if I need to boil something up or as an extra
cooking ring when everything else is occupied. Although you must
use steel or cast iron pots on them (no aluminium, copper or al-
clad), this is not a problem as inexpensive steel pots and pans
abound.


Cheers - Joe